Percentage Calculator

Multiply the number by the percentage and divide by 100. For example, 20% of 200 = (20/100) × 200 = 40.

To add X%: multiply the number by (1 + X/100). To subtract X%: multiply by (1 − X/100). The calculator does this for you when you choose add or subtract.

Percentage change = ((New value − Old value) / Old value) × 100. It shows how much a value increased or decreased relative to the original.

Yes. For a discount, subtract the percentage from the price. For a markup, add the percentage. The discount calculator is also available for sale prices.